Improvement in seats for carriages and wagons



c.` K. LEHMANN. Seats fur'Carriages and Wagons'.

N0. 143,515' l Patented 0ct.7,1873.

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CHRISTIAN K. LEHMANN, OF SAVANNAH, OHIO.

IMPROVEMENT IN SEATS F-OR CARRIAGES AND WAGONS.

Specification forming part of Letters Patent No. 143,515, dated October 7, 1873; application led June 9, 1873.

To all whom it may concer/n:-

Beit known that I, GnnrsrrAN K. LEHMANN, of Savannah, in the county of Ashland and State of Ohio, have invented a new and valuable Improvement in Carriage-Springs 5 and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of my improved carriage-spring by a central cross-section. Fig. 2 is a bottom view of the same.

My invention relates to torsion-springs for vehicles 5 and it consists in the construction and arrangement of a torsion-spring, supportingfrod, and link, as will be hereinafter described. The object of my invention is to avoid the stiffness of short torsion-springs, and the weakness of thin torsion-springs, by doubling up a torsion-spring heavy enough for the purpose one or several times, thereby gaining a very long center line for the torsion without taking up more room for it than usual, and thereby gaining the same strength and ease of motion in a very small allowance of space by one single spring as a combination of smaller springs with single torsion-rods would afford.

In the drawings, my invention is represented as applied to a carriage-seat, and Al denotes the seat-board, with the spring-bars a at the ends; and B denotes the connecting or brace bar of the lower springbars b. The springs O are so bent that they have short arms c, with eyes c1, which serve to fasten the1n,with screws d3, to the carriage-seat. The torsional part of such a spring consists of a doubling of the spring-rod in U shape, and in the direction of the seat-board, forming a right angle with the arm c, and ending with vanother rectangular arm, c2, and an eye-bearing, c3. The arms c2 are the movable arm/s, and they extend downward in a diagonal direction from the spring bar a to an upwardly-curved steady-bar, D, with slotted end bosses d and pivot-pins di at the front, and plain bosses d2, with swinging chainlinks E. The right and leftfront springs C are connected with the back parts of the bars D by means of the links E, which serve to aid thespring-arms c2 in spreading when operated. The two rear springs C are connected to the front ends of the bars D by being inserted into the slotted bosses d, and by being secured thereto with pins d1. The springs are so arranged and fastened to the seat-board that their torsional parts are at a distance, preventing their touching each other and interfering with each others motion when operated. The

. last return-length of the spring is fastened to the board A by gas-pipe hooks or clamps, to keep the spring in the right position.

When operated, each return-length of the torsion part of the spring takes up a proportional part of the torsion, and the spring works with the same ease and power as if all the return-lengths were united into one stra-ight rod.

I have also found that if I twist the wire in the direction of the torsional strain before the spring is shaped I obtain a more pliable spring, which is less apt to snap.

What I claim as new, and desire to secure by Letters Patent, is-

The combination of the torsion-springs C and the supporting steady-rods D withV the links E, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

CHRISTIAN K.` LEHMANN.

Witnesses N. J. PAXroN, MARY A. PAXroN. 

